A powder spraying and mixing device and a construction method

Abstract

The present application provides a powder spraying and stirring device and a construction method. The powder spraying and stirring device includes a machine body, a driving member, an inner drill rod, an outer drill rod and stirring blades. The driving member is arranged on the machine body; the inner drill rod is arranged inside the outer drill rod, the driving member drives the inner drill rod and the outer drill rod to rotate respectively, and a plurality of stirring blades are arranged. The plurality of stirring blades are respectively connected to the inner drill rod and the outer drill rod; the stirring blades include support blades, folding blades and limit baffles. The support blades are respectively connected to the inner drill rod and the outer drill rod, and the support blades and the folding blades are hinged; the limit baffle is connected to the support blade, the limit baffle abuts against the folding blade, and the limit baffle is used to limit the position of the folding blade. A resistance plate is connected to one side of the folding blade. The length direction of the resistance plate is parallel to the length direction of the folding blade, and the thickness of the resistance plate is greater than the thickness of the folding blade. The present application can facilitate the formation of a variable cross-section pile type.

Description

Technical Field

[0001] This application relates to the technical field of dry jet mixing pile construction, and particularly relates to a powder spraying and stirring device and a construction method. Background Art

[0002] The dry jet mixing pile is a form of the deep mixing method for ground reinforcement, also known as a reinforced soil pile, and is commonly used to reinforce silt, silty clay, silt, and cohesive soil with a relatively high water content. It uses a powder-like curing agent for soft foundation mixing treatment, and through a special powder spraying and stirring device, the soft soil and the curing agent (in slurry form and powder form) are forcibly stirred in place. By using a series of physical and chemical reactions between the curing agent and the soft soil, the soft soil is hardened into a high-quality foundation with integrity, water stability, and certain strength.

[0003] During the construction of dry jet mixing piles, a powder spraying and stirring device is required. The powder spraying and stirring device generally includes a machine body, a driving motor, an inner drill rod, an outer drill rod, and stirring blades. There are multiple stirring blades, and the stirring blades are respectively fixedly connected to the inner drill rod and the outer drill rod. The driving motor, the inner drill rod, and the outer drill rod are all installed on the machine body, and the driving motor drives the inner drill rod and the outer drill rod to rotate respectively. The machine body has a lifting mechanism, and the lifting mechanism can drive the inner drill rod and the outer drill rod to move up and down, so as to perform drilling and lifting operations, and finally a dry jet mixing pile can be formed.

[0004] In order to adapt to the foundation with varying hardness of the formation and improve a certain anti-pulling performance, it is necessary for the pile diameter to change with the hardness of the formation. During the pile forming process, the drill bit needs to be freely and flexibly changed according to the needs of the formation structure to form a variable cross-section pile type with different pile diameters. However, the diameters of the stirring blades of the inner drill rod and the outer drill rod in the related technology are fixed, and only a pile type with a fixed diameter can be formed, and it is difficult to form a variable cross-section pile type, so there is room for improvement. Summary of the Invention

[0005] In order to facilitate the formation of a variable cross-section pile type, this application provides a powder spraying and stirring device and a construction method.

[0006] In a first aspect, this application provides a powder spraying and stirring device, adopting the following technical solution:

[0007] A powder spraying and stirring device includes a machine body, a driving member, an inner drill rod, an outer drill rod, and stirring blades. The driving member is arranged on the machine body; the inner drill rod is arranged inside the outer drill rod, the driving member drives the inner drill rod and the outer drill rod to rotate respectively, there are multiple stirring blades, and the multiple stirring blades are respectively connected to the inner drill rod and the outer drill rod;

[0008] The mixing blades include support blades, folding blades and limit baffles. The support blades are respectively connected to the inner drill pipe and the outer drill pipe. The support blades and the folding blades are hinged; the limit baffles are connected to the support blades and are in contact with the folding blades. The limit baffles are used to limit the position of the folding blades.

[0009] By adopting the above technical solution, when the inner drill pipe and the outer drill pipe rotate, the folding blades are received in the support blades; when the rotation directions of the inner drill pipe and the outer drill pipe are changed, the folding blades unfold and are in contact with the limit baffles, thereby changing the diameter of the pile hole, improving the flexibility and adaptability of the equipment. The setting of the limit baffles effectively limits the unfolding range of the folding blades, ensuring that the mixing blades can still maintain a stable shape and function under different geological conditions, thus achieving a more uniform mixing effect and improving the quality and stability of the jet grouting pile.

[0010] Optionally, a resistance plate is connected to one side of the folding blade. The length direction of the resistance plate is parallel to the length direction of the folding blade, and the resistance plate protrudes from the surface of the folding blade.

[0011] By adopting the above technical solution, the setting of the resistance plate enables the folding blades to better cut and mix the soil during rotation, improving the mixing efficiency and uniformity. The resistance plate protrudes from the surface of the folding blade and is subject to a certain resistance when mixing the soil, which is beneficial to the unfolding or receiving of the folding blades.

[0012] Optionally, a transmission mechanism is provided on the machine body. The transmission mechanism includes a transmission box, an inner shaft and an outer shaft. The transmission box is arranged on the machine body. The inner shaft and the outer shaft are both rotatably connected to the transmission box. The inner shaft is connected to the inner drill pipe;

[0013] The outer shaft includes a support outer shaft and a telescopic outer shaft. The support outer shaft and the telescopic outer shaft are slidably connected. The telescopic outer shaft is connected to the outer drill pipe; an adjustment assembly is arranged between the support outer shaft and the telescopic outer shaft. The adjustment assembly is used to adjust the distance that the telescopic outer shaft slides along the axis of the support outer shaft.

[0014] By adopting the above technical solution, the driving member drives the inner drill pipe to rotate through the inner shaft, and the driving member drives the outer drill pipe to rotate through the outer shaft. When the adjustment assembly makes the telescopic outer shaft slide along the axis of the support outer shaft, the relative positions of the inner drill pipe and the outer drill pipe can be adjusted, thereby changing the distance between the mixing blades on the inner drill pipe and the outer drill pipe. The distance between the mixing blades can be pre-adjusted according to the hardness of the soil layer, enhancing the mixing effect and improving the applicability of the device.

[0015] Optionally, the adjustment assembly includes:

[0016] A support ring, which is connected to the support outer shaft;

[0017] A connecting column, which is connected to the telescopic outer shaft and passes through the support ring;

[0018] A locking member for locking the connecting column to the support ring.

[0019] By adopting the above technical solution, the distance that the connecting column passes through the support plate is adjusted, and then the position of the connecting rod is locked by using the locking member. The connecting column connects the support ring and the telescopic outer shaft, so that the sliding distance of the telescopic outer shaft on the support outer shaft can be adjusted.

[0020] Optionally, the locking member includes adjusting nuts, which are threadedly connected to the connecting column. There are multiple adjusting nuts, which are located on both sides of the support ring, and the adjusting nuts clamp the support ring.

[0021] By adopting the above technical solution, multiple adjusting nuts clamp the support ring, thereby locking the position of the connecting column on the support ring, improving the stability and reliability of the telescopic outer shaft, reducing the looseness or displacement of the telescopic outer shaft caused by external forces, and improving the overall stability of the equipment. In addition, the adjusting nuts are threadedly connected to the connecting column, which is also convenient for adjustment and maintenance, and improves the operation convenience.

[0022] Optionally, the adjusting assembly further includes a reinforcing rod and a rotating ring seat. The rotating ring seat is connected to the transmission box, the reinforcing rod is respectively connected to the rotating ring seat and the support ring, and the reinforcing rod is rotatably connected to the transmission box through the rotating ring seat.

[0023] By adopting the above technical solution, the reinforcing rod can provide a supporting force for the support ring and improve the structural strength of the support ring.

[0024] Optionally, a receiving ring groove is formed at the end of the support outer shaft, and the telescopic outer shaft is inserted into the receiving ring groove; a dust plug is connected to the support outer shaft, the dust plug is closely attached to the telescopic outer shaft, and the dust plug seals the receiving ring groove.

[0025] By adopting the above technical solution, the receiving ring groove formed at the end of the support outer shaft enables the telescopic outer shaft to be inserted smoothly and remain stable, ensuring the normal operation of the outer drill pipe. The dust plug is closely attached to the telescopic outer shaft and seals the receiving ring groove, effectively reducing the entry of dust and other impurities, and improving the reliability and maintenance cycle of the equipment.

[0026] Optionally, the transmission mechanism includes a transmission shaft, a first transmission assembly and a second transmission assembly, the transmission shaft is rotatably connected to the transmission box, and the driving member drives the transmission shaft to rotate; the first transmission assembly is respectively connected to the transmission shaft and the inner shaft, and the second transmission assembly is respectively connected to the transmission shaft and the outer shaft.

[0027] By adopting the above technical solution, the driving member transmits power to the transmission shaft, and the transmission shaft transmits power to the inner shaft through the first transmission assembly, thereby driving the inner drill rod to rotate. The transmission shaft transmits power to the outer shaft through the second transmission assembly, thereby driving the outer drill rod to rotate.

[0028] Optionally, the stirring blades located on the inner drill rod and the outer drill rod are staggered.

[0029] By adopting the above technical solution, the mixing blades of the inner drill rod and the outer drill rod are staggered, which improves the mixing efficiency and uniformity, makes the curing agent and the soft soil mixed more fully, and thus enhances the overall stability and strength of the powder injection pile.

[0030] In a second aspect, the present application provides a powder injection pile construction method, comprising the following steps:

[0031] S1: Drilling and sampling: drilling holes in the foundation to be constructed and taking out soil samples, and analyzing the soil samples;

[0032] S2: Trial operation: use a powder spraying and mixing device to drill a pile hole with a certain depth in the test area, understand the difficulty of drilling and lifting, and determine the drilling and lifting speed;

[0033] S3: Drilling operation, start the powder spraying and stirring device, make the powder spraying and stirring device cut the soil downward, make the inner drill rod and the outer drill rod rotate in the positive and negative directions respectively, drive the stirring blades to stir the soil, and input the curing agent into the soil; after reaching the predetermined depth, change the rotation direction of the inner drill rod and the outer drill rod to form a variable cross-section pile type, until the construction reaches the designed depth;

[0034] S4: Lifting and stirring: lift the stirring blades, stop inputting the curing agent into the pile hole, and change the rotation direction of the inner drill rod and the outer drill rod; after reaching the predetermined depth, change the rotation direction of the inner drill rod and the outer drill rod again until the inner drill rod and the outer drill rod leave the top of the pile hole.

[0035] In summary, the present application includes at least one of the following beneficial effects:

[0036] 1. By adopting the foldable mixing blade design, the deployment state of the mixing blade can be adjusted under different stratum conditions, thereby realizing the formation of variable cross-section piles, enhancing the flexibility and adaptability of construction, and effectively solving the limitations of the fixed diameter mixing blades in related technologies;

[0037] 2. The design of the limit baffle between the folding blade and the support blade can limit the unfolding angle of the folding blade, ensuring the stability and reliability of the stirring blade;

[0038] 3. Adjust the length of the adjusting connecting column passing through the support ring, and then use the locking part to lock the position of the connecting column, so that the moving distance of the telescopic outer shaft on the support outer shaft can be adjusted, and further the distance between the stirring blades on the inner drill pipe and the outer drill pipe can be adjusted to improve the adaptability. Brief Description of the Drawings

[0039] Figure 1 is the front view structural schematic diagram of the powder spraying and stirring device in Embodiment 1 of the present application;

[0040] Figure 2 is the sectional structural schematic diagram of the powder spraying and stirring device in Embodiment 1 of the present application;

[0041] Figure 3 is Figure 2 the enlarged structural schematic diagram of part A in

[0042] Figure 4 is the front view structural schematic diagram of the stirring blade in Embodiment 1 of the present application;

[0043] Figure 5 is the top view structural schematic diagram of the stirring blade in Embodiment 1 of the present application.

[0044] Description of the Reference Numerals: 1, driving part; 2, inner drill pipe; 21, discharge port; 3, outer drill pipe; 4, stirring blade; 41, support blade; 42, folding blade; 43, limit baffle; 44, resistance plate; 5, transmission mechanism; 51, transmission box; 52, transmission shaft; 53, inner shaft; 54, outer shaft; 541, support outer shaft; 542, telescopic outer shaft; 55, first transmission component; 551, transmission chain; 552, transmission sprocket; 56, second transmission component; 561, driving gear; 562, driven gear; 57, ash spraying device; 58, dust-proof plug; 6, adjusting component; 61, support ring; 62, connecting column; 63, locking part; 64, reinforcing rod; 65, rotating ring seat. Detailed Description of the Embodiment

[0045] The following Figures 1-5 further describes the present application in detail with reference to the attached

[0046] Embodiment 1:

[0047] Embodiment 1 of the present application provides a powder spraying and stirring device.

[0048] Refer to Figure 1, the powder spraying and stirring device includes a machine body, a driving member 1 and a transmission mechanism 5. The transmission mechanism 5 and the driving member 1 are both installed on the machine body. The driving member 1 is specifically a motor. The lifting mechanism of the machine body can drive the driving member 1 and the transmission mechanism 5 to move up and down, so as to perform drilling and lifting operations.

[0049] Reference Figure 1 and Figure 2 , the transmission mechanism 5 includes a transmission box 51, a transmission shaft 52, an inner shaft 53, an outer shaft 54, a first transmission component 55, a second transmission component 56 and a dust spraying device 57. The transmission box 51 is installed on the machine body. The transmission shaft 52, the inner shaft 53 and the outer shaft 54 are all rotatably connected to the transmission box 51. The driving member 1 can drive the transmission shaft 52 to rotate. The inner shaft 53 is disposed inside the outer shaft 54.

[0050] Reference Figure 1 and Figure 2 , the first transmission component 55 includes a transmission chain 551 and transmission sprockets 552. There are two transmission sprockets 552, and the two transmission sprockets 552 are respectively fixedly connected to the transmission shaft 52 and the inner shaft 53. The transmission chain 551 is sleeved on the two transmission sprockets 552, so that the transmission shaft 52 transmits power to the inner shaft 53 through the first transmission component 55.

[0051] Reference Figure 1 and Figure 2 , the outer shaft 54 includes a support outer shaft 541 and a telescopic outer shaft 542. The support outer shaft 541 is rotatably connected to the transmission box 51. The second transmission component 56 includes a driving gear 561 and a driven gear 562. The driving gear 561 is fixedly connected to the transmission shaft 52, and the driven gear 562 is fixedly connected to the support outer shaft 541. The driving gear 561 and the driven gear 562 are meshed, and the transmission shaft 52 transmits power to the support outer shaft 541 through the second transmission component 56, and the rotation directions of the support outer shaft 541 and the inner shaft 53 are opposite.

[0052] Reference Figure 2 and Figure 3 , a receiving annular groove is formed at the bottom end of the support outer shaft 541. The telescopic outer shaft 542 is inserted into the receiving annular groove, and the telescopic outer shaft 542 can slide along the axial direction of the support outer shaft 541. The inner shaft 53 is coaxially connected with an inner drill rod 2 through a flange, and the telescopic outer shaft 542 is coaxially connected with an outer drill rod 3 through a flange. A dust-proof plug 58 is fixedly connected to the bottom end of the support outer shaft 541. The dust-proof plug 58 is closely attached to the telescopic outer shaft 542. The dust-proof plug 58 seals the receiving annular groove to reduce the entry of external impurities into the receiving annular groove.

[0053] Reference Figure 1 and Figure 2, the ash spraying device 57 is rotatably connected to and communicated with the inner shaft 53, and the ash spraying device 57 can transport the curing agent into the inner shaft 53. The inner drill rod 2 is connected with a discharge port 21, and the curing agent inside the inner drill rod 2 is sprayed out from the discharge port 21, so that the curing agent is mixed with the soil body.

[0054] Reference Figure 2 And Figure 3 , an adjusting assembly 6 is arranged on the transmission box 51. The adjusting assembly 6 includes a support ring 61, a connecting column 62 and a locking member 63. The support ring 61 is sleeved on the bottom end of the support outer shaft 541, and the support ring 61 is fixedly connected with the support outer shaft 541. The connecting column 62 is fixedly connected with the bottom end of the telescopic outer shaft 542, and the connecting column 62 passes through the support ring 61. In this embodiment, the locking member 63 specifically adopts an adjusting nut. There are multiple adjusting nuts. The adjusting nuts are threadedly connected with the connecting column 62. The adjusting nuts clamp the support ring 61 from both sides of the support ring 61, so as to lock the position of the connecting column 62, and further lock the length of the telescopic outer shaft 542 extending from the support outer shaft 541. A plurality of connecting columns 62 are arranged around the circumferential side of the support outer shaft 541, which improves the connection strength between the support outer shaft 541 and the telescopic outer shaft 542. When the support outer shaft 541 rotates, the support ring 61 rotates with the support outer shaft 541. The support ring 61 drives the telescopic outer shaft 542 to rotate through the connecting column 62, and the telescopic outer shaft 542 drives the outer drill rod 3 to rotate.

[0055] Reference Figure 2 And Figure 3 , the adjusting assembly 6 further includes a reinforcing rod 64 and a rotating ring seat 65. The rotating ring seat 65 includes a bottom ring and a rotating ring. The bottom ring and the rotating ring are rotatably connected. The rotation axis of the rotating ring is coaxial with the rotation axis of the support outer shaft 541. The bottom ring is fixedly connected with the transmission box 51. One end of the reinforcing rod 64 is fixedly connected with the rotating ring, and the other end of the reinforcing rod 64 is fixedly connected with the support ring 61. The reinforcing rod 64 can provide a supporting force for the support ring 61, and improve the structural strength and stability of the support ring 61.

[0056] Reference Figure 1 , stirring blades 4 are arranged at the bottom ends of both the inner drill rod 2 and the outer drill rod 3. The stirring blades 4 on the inner drill rod 2 and the stirring blades 4 on the outer drill rod 3 are arranged in a staggered manner. Specifically, the stirring blades 4 on the inner drill rod 2 and the stirring blades 4 on the outer drill rod 3 are perpendicular to each other in a plane.

[0057] Reference Figure 4 And Figure 5, the stirring blade 4 includes a supporting blade 41, a folding blade 42, a limiting baffle 43 and a resistance plate 44. A plurality of supporting blades 41 are respectively fixedly connected to the inner drill rod 2 and the outer drill rod 3, and the folding blade 42 is hinged to the supporting blade 41. The limiting baffle 43 is fixedly connected to the end of the supporting blade 41 and extends a certain length. When the folding blade 42 rotates to the fully unfolded state, the folding blade 42 abuts against the limiting baffle 43.

[0058] Reference Figure 4 and Figure 5 , the resistance plate 44 is fixedly connected to one side of the folding blade 42, and the resistance plate 44 protrudes from the surface of the folding blade 42. When the stirring blade 4 rotates, the resistance plate 44 is subjected to a certain resistance, which is beneficial to the unfolding of the folding blade 42.

[0059] Reference Figure 1 and Figure 4 , since the rotation directions of the inner drill rod 2 and the outer drill rod 3 are opposite, the unfolding directions of the folding blades 42 located on the inner drill rod 2 and the outer drill rod 3 are also opposite. When the output shaft of the driving member 1 rotates forward, all the folding blades 42 do not unfold, that is, the diameters of the stirring blades 4 of the inner drill rod 2 and the outer drill rod 3 are the same at this time; when the output shaft of the driving member 1 rotates reversely, all the folding blades 42 are in the unfolded state, that is, the diameters of the stirring blades 4 of the inner drill rod 2 and the outer drill rod 3 are also the same at this time. By controlling the forward and reverse rotation of the output shaft of the driving member 1, pile holes with different diameters can be formed.

[0060] The implementation principle of Embodiment 1 of the present application for a powder jet mixing device is as follows: The driving member 1 drives the transmission shaft 52 to rotate, and the transmission shaft 52 drives the inner shaft 53 and the outer shaft 54 to rotate through the first transmission assembly 55 and the second transmission assembly 56 respectively, so that the inner drill rod 2 and the outer drill rod 3 rotate in opposite directions. Adjust the distance that the adjusting connecting column 62 passes through the support ring 61, and use the locking member 63 to lock the position of the connecting column 62, so as to adjust the distance that the telescopic outer shaft 542 extends, and further adjust the distance between the stirring blades 4 on the outer drill rod 3 and the inner drill rod 2. The inner drill rod 2 and the outer drill rod 3 respectively drive the stirring blades 4 to rotate. By controlling the forward or reverse rotation of the output shaft of the driving member 1, it is possible to control whether the folding blade 42 is in the unfolded state, and thus form a variable cross-section pile type.

[0061] Embodiment 2:

[0062] Embodiment 2 of the present application provides a powder jet pile construction method, using the powder jet mixing device in Embodiment 1, including the following steps:

[0063] S1: Drilling and sampling: Drill the foundation to be constructed and take out the soil sample, and analyze the soil sample;

[0064] S2: Trial operation: Use the powder jet mixing device to drill a pile hole with a certain depth in the test area, grasp the difficulty of drilling down and lifting, and determine the drilling down and lifting speeds;

[0065] S3: Drilling operation: Start the powder jet mixing device, make the powder jet mixing device cut the soil downward, make the inner drill pipe 2 and the outer drill pipe 3 rotate in opposite directions respectively, drive the mixing blades 4 to mix the soil body, and input the curing agent into the soil body; After reaching the predetermined depth, change the rotation directions of the inner drill pipe 2 and the outer drill pipe 3 to form pile holes with different diameters until the construction reaches the design depth;

[0066] S4: Lifting and mixing: Lift the mixing blades 4, stop inputting the curing agent into the pile hole, and the mixing blades 4 mix the soil body and the curing agent; After reaching the predetermined depth, change the rotation directions of the inner drill pipe 2 and the outer drill pipe 3 again until the inner drill pipe 2 and the outer drill pipe 3 leave the top end of the pile hole.

[0067] S5: Printing receipt: After the construction reaches the top end of the pile hole, the control cabinet automatically ends the printing of the receipt, and the receipt records the construction parameter information.

[0068] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A powder spraying and stirring device, characterized in that, It includes a machine body, a driving member (1), an inner drill pipe (2), an outer drill pipe (3) and stirring blades (4). The driving member (1) is arranged on the machine body; the inner drill pipe (2) is arranged inside the outer drill pipe (3). The driving member (1) drives the inner drill pipe (2) and the outer drill pipe (3) to rotate respectively. There are multiple stirring blades (4), and the multiple stirring blades (4) are respectively connected to the inner drill pipe (2) and the outer drill pipe (3). The stirring blade (4) includes a support blade (41), a folding blade (42) and a limit baffle (43). The multiple support blades (41) are respectively connected to the inner drill pipe (2) and the outer drill pipe (3). The support blade (41) and the folding blade (42) are hinged; the limit baffle (43) is connected to the support blade (41), and the limit baffle (43) abuts against the folding blade (42). The limit baffle (43) is used to limit the position of the folding blade (42). A transmission mechanism (5) is arranged on the machine body. The transmission mechanism (5) includes a transmission box (51), an inner shaft (53) and an outer shaft (54). The transmission box (51) is arranged on the machine body. The inner shaft (53) and the outer shaft (54) are both rotatably connected to the transmission box (51). The inner shaft (53) is connected to the inner drill pipe (2). The outer shaft (54) includes a support outer shaft (541) and a telescopic outer shaft (542). The support outer shaft (541) and the telescopic outer shaft (542) are slidably connected. The telescopic outer shaft (542) is connected to the outer drill pipe (3); an adjustment component (6) is arranged between the support outer shaft (541) and the telescopic outer shaft (542). The adjustment component (6) is used to adjust the distance that the telescopic outer shaft (542) slides along the axis of the support outer shaft (541). The adjustment component (6) includes: A support ring (61), and the support ring (61) is connected to the support outer shaft (541). A connecting column (62), and the connecting column (62) is connected to the telescopic outer shaft (542). The connecting column (62) passes through the support ring (61). A locking member (63), and the locking member (63) is used to lock the connecting column (62) on the support ring (61). The adjustment component (6) further includes a strengthening rod (64) and a rotating ring seat (65). The rotating ring seat (65) is connected to the transmission box (51). The strengthening rod (64) is respectively connected to the rotating ring seat (65) and the support ring (61). The strengthening rod (64) is rotatably connected to the transmission box (51) through the rotating ring seat (65).

2. The powder spraying and stirring device according to claim 1, wherein, A resistance plate (44) is connected to one side of the folding blade (42). The length direction of the resistance plate (44) is parallel to the length direction of the folding blade (42). The resistance plate (44) protrudes from the surface of the folding blade (42).

3. A powder spraying and stirring device according to claim 1, characterized in that, The locking member (63) includes an adjusting nut which is threadedly connected to the connecting column (62). A plurality of the adjusting nuts are provided and are located on both sides of the support ring (61), and the adjusting nuts clamp the support ring (61).

4. A powder spraying and stirring device according to claim 1, characterized in that, An accommodation ring groove is formed at the end of the support outer shaft (541), and the telescopic outer shaft (542) is inserted into the accommodation ring groove; a dust plug (58) is connected to the support outer shaft (541), the dust plug (58) is in close contact with the telescopic outer shaft (542), and the dust plug (58) seals the accommodation ring groove.

5. A powder spraying and stirring device according to claim 1, characterized in that, The transmission mechanism (5) includes a transmission shaft (52), a first transmission assembly (55) and a second transmission assembly (56). The transmission shaft (52) is rotatably connected to the transmission box (51), and the driving member (1) drives the transmission shaft (52) to rotate; the first transmission assembly (55) is respectively in transmission connection with the transmission shaft (52) and the inner shaft (53), and the second transmission assembly (56) is respectively in transmission connection with the transmission shaft (52) and the support outer shaft (541).

6. The powder spraying and stirring device according to claim 1, characterized in that, The mixing blades (4) of the inner drill pipe (2) and the outer drill pipe (3) are arranged in a staggered manner.

7. A construction method for powder jet piles, characterized in that, Using the powder spraying and mixing device according to any one of claims 1-6, comprising the following steps: S1: Drilling and sampling, drilling the foundation to be constructed to take out soil samples and analyzing the soil samples; S2: Trial operation, using the powder spraying and mixing device in the test area to drill a pile hole with a certain depth, grasping the difficulty of drilling down and lifting, and determining the drilling down and lifting speeds; S3: Drilling operation, starting the powder spraying and mixing device to cut the soil downward, rotating the inner drill pipe (2) and the outer drill pipe (3) in forward and reverse directions respectively to drive the mixing blades (4) to mix the soil mass, and inputting a curing agent into the soil mass; after reaching the predetermined depth, changing the rotation directions of the inner drill pipe (2) and the outer drill pipe (3) to form pile holes with different diameters until the construction reaches the design depth; S4: Lifting and mixing: Lifting the mixing blades (4), stopping inputting the curing agent into the pile hole, and the mixing blades (4) mixing the soil mass and the curing agent; after reaching the predetermined depth, changing the rotation directions of the inner drill pipe (2) and the outer drill pipe (3) again until the inner drill pipe (2) and the outer drill pipe (3) leave the top end of the pile hole.

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